Baby Crib Mattress Dimensions

Knowing baby crib mattress dimensions is a must. Picking the right measurements guarantees your baby will be safe and comfortable.

Standard Sizes

The standard length is 51-5/8 inches. The standard width is 27-1/4 inches. Depths are usually no more than 6 inches. For foam mattresses, the depths can be between 4 to 6 inches. Depths for coil mattresses can be between 5 to 6 inches.

Safety wise, mattress thickness isn’t as significant as width or length. But be certain you are using sheets of the proper size. You are using the right sheet if it is tight at the corners and you can tuck it in securely.

Importance of Proper Fitting

Proper baby crib mattress dimensions and sheets are a must. The fit is right if they are snug against a crib’s sides. If there is space, the baby may go under it. This can lead to suffocation or choking. A baby’s head might get stuck between the mattress and the crib.

The Finger Test

Try putting your fingers between the crib and mattress. If you can put two fingers side by side between them, the mattress is too small. If you can just put in one finger, then it is the right size. Perform the finger test before putting your baby in the crib. Do not take a manufacturer’s word for it. Laws are very strict about this, but manufacturing defects can and do take place. It is better to be safe than sorry.

Non-Standard Mattresses and Cribs

If you prefer a non-standard size, there are companies that offer this service. Mattresses have to be of the highest quality.
Firmness

Babies must sleep on a firm mattress. Aside from the size, firmness is the next most important factor. Firmness has to be all over the mattress. It won’t take long before your baby starts moving around the crib. They will change positions often when awake and asleep. If the sleeping surface is too soft they will feel uncomfortable.

Mattresses today have border rods which keep the surface from sinking. X frame bars or interior steel vertical bars provides an even surface. To test a mattress’ firmness, put your hands on the center at opposing sides. The harder it is to squeeze, the firmness it is.

Baby crib mattress dimensions are important, but that is only part of the story. Firmness is also crucial. Properly made, a mattress will not conform to your baby’s shape and snap back instead.